JPH056249U - Variable speed pulley structure of continuously variable transmission - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to reduce the sliding resistance of the movable pulley and to improve the durability of the V-belt by preventing the movable pulley from swinging and falling. [Structure] The rotary shaft 3 of the speed change pulley 2 including a fixed pulley 4 fixed to the rotary shaft 3 and a movable pulley 6 slidably moving on the rotary shaft 3 in a direction in which the fixed pulley 4 is moved toward and away from the fixed pulley 4. Is made of steel, and a plating layer plated with hard chrome is formed on the outer peripheral surface thereof. A bearing 5 is interposed between the rotating shaft 3 and the movable pulley 6, and the outer peripheral surface of the bearing 5 is made of steel. The ring portion is made of a porous bronze layer on the inside, and a resin sliding layer impregnated with a resin is formed on the inside.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a speed change pulley in a continuously variable transmission, and more particularly to a bearing structure between a rotary shaft and a movable pulley.

[0002]

[Prior art and its problems]

 Conventionally, as shown in the sectional configuration diagram of FIG. 5, a speed change pulley of a continuously variable transmission has a fixed pulley 4 fixed to a rotary shaft 3 and a fixed pulley 4 on the rotary shaft 3 in a direction in which the fixed pulley 4 is separated from and in contact with the fixed pulley 4. The movable pulley 6 slidably moves around the movable pulley 6, and the V belt 7 wound around the fixed pulley 4 and the movable pulley 6. A bearing hole 6a is formed in the inner peripheral surface of the movable pulley 6. The outer end portion of the bearing hole 6a is sealed by oil seals 51, 51, and grease (grease) 52 is sealed inside the bearing hole 6a for lubrication.

In such a structure, the sliding resistance of the movable pulley 6 is high, and the gap between the rotary shaft 3 and the inner peripheral surface of the movable pulley 6 is large, so that the movable pulley 6 swings and falls. And the like, which causes a fluctuating load on the V-belt 7 and shortens the life of the V-belt 7. Further, leakage of the oil / fat 52 causes oil / fat to adhere to the V-belt 7 to cause slippage. There were problems such as.

[0004]

[Means for Solving the Problems]

 The present invention has been made in view of the above conventional problems, and an object thereof is to provide a speed change pulley structure that can be used without lubrication, does not cause V-belt slip, and has low sliding resistance. The gist of the invention is a continuously variable transmission including a fixed pulley fixed to a rotary shaft and a movable pulley that is externally fitted to the rotary shaft and is slidably movable on the rotary shaft in a direction in which the fixed pulley is separated from and in contact with the fixed pulley. In a speed change pulley of a machine, the rotating shaft is made of steel, and a plating layer plated with hard chrome is formed on the outer peripheral surface of the rotating shaft and between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the movable pulley. A bearing is interposed in the bearing. The bearing has an outer peripheral surface that abuts the inner peripheral surface of the movable pulley made of a steel ring portion, and a sintered porous bronze layer is formed inside the steel ring portion. Is formed, and further said rotation The inner peripheral surface in sliding contact with the outer peripheral surface of is that the resin sliding layer due to the resin impregnation is made form.

[0005]

[Action]

 Since the outer peripheral surface of the rotating shaft is a plated layer with hard chrome plating, sliding contact friction with the bearing is greatly reduced, and the generation of iron oxide on the outer periphery of the rotating shaft is suppressed, and iron oxide fine particles The wear due to the cutting action due to is reduced, and the expansion of the bearing gap due to wear can be reduced. Also, the bearing fitted on the outer circumference of the rotary shaft has a resin sliding layer with the inner peripheral surface impregnated with resin, and is made up of a porous bronze layer and a steel ring part, so the outer circumference of the rotary shaft is The bearing can be fitted externally with a very small gap, there is no tilting or wobbling of the movable pulley, and the movable pulley can be moved by sliding it smoothly against the rotating shaft via the resin sliding layer. Therefore, it is possible to provide a speed change pulley structure which is free from grease and does not cause slippage of the V belt.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a main part of a continuously variable transmission. A variable speed pulley 2 that constitutes, for example, a drive pulley of the continuously variable transmission 1 includes a fixed pulley 4 fixed to a rotary shaft 3 and a fixed pulley 4 fixed to the rotary shaft 3. A movable pulley 6 is provided which can slide on the rotary shaft 3 relative to the pulley 4 and move in a direction of moving away from and in contact with the fixed pulley 4. A V belt 7 is wound between the fixed pulley 4 and the movable pulley 6. A bearing 5 is interposed between the outer peripheral surface of the rotary shaft 3 and the inner peripheral surface of the movable pulley 6.

The left end portion of the rotary shaft 3 is supported via a rolling bearing 8, and the rolling bearing 8 is provided in the air chamber casing 9. The right end of the rotary shaft 3 is supported by a rolling bearing 10, and the rolling bearing 10 is provided in a clutch casing 11. Further, an oil chamber casing 12 is provided on the left side of the clutch casing 11 in the drawing, and an oil chamber 15 capable of storing oil is formed between the clutch casing 11 and the oil chamber casing 12, and inside thereof. Various gears 13 are assembled. On the other hand, between the oil chamber casing 12 and the air chamber casing 9 is an air chamber 14 in which lubricating oil does not exist.

FIG. 2 shows a cross-sectional configuration diagram of the bearing 5, and FIG. 3 shows an enlarged view of a main part thereof. That is, the outer peripheral side of the bearing 5 is a steel ring portion 5a, and the outer periphery of the steel ring portion 5a is fitted to the inner peripheral surface of the movable pulley 6. A porous bronze layer 5b is integrated by sintering inside the steel ring 5a, and a resin sliding layer 5c is formed by impregnating a resin inside the porous bronze layer 5b. .. The resin sliding layer 5c is in sliding contact with the outer circumference of the rotary shaft 3. The resin sliding layer 5c is obtained by impregnating the porous bronze layer 5b with, for example, a polyetherketone resin, a polyimide resin, a polytetrafluoroethylene resin or the like alone or in a mixed state, and a layer having good lubricity is formed. Is forming.

The rotating shaft 3 is made of medium carbon steel (S45C, etc.) or low carbon alloy steel (SCM420, etc.), and a hard chromium plating layer 3a is formed on the outer periphery of the rotating shaft 3 for surface hardening. It has been treated and has a high hardness surface. FIG. 4 is a configuration diagram in which a plating layer 3a is formed by hard chrome plating on the outer circumference of the rotary shaft. Therefore, when the movable pulley 6 slides on the rotation 3 during shifting of the speed change pulley 2, the resin sliding layer 5c of the bearing 5 makes sliding contact with the outer peripheral surface of the rotating shaft 3, and its sliding resistance is low, so that The pulley 6 can be smoothly slid.

Further, in this example, since the bearing 5 having such a structure is interposed, the gap between the bearing 5 and the rotary shaft 3 can be made extremely small, and the runout and tilt of the movable pulley 6 are small. Since the variable load of the V-belt 7 is reduced, the durability of the V-belt 7 is improved. Further, since it is possible to use it without lubrication, unlike the conventional grease, there is no V-belt slip due to leakage of lubricating oil.

[0011]

[Effect of the device]

 The present invention comprises a stepless pulley including a fixed pulley fixed to a rotary shaft and a movable pulley externally fitted to the rotary shaft and slidably movable on the rotary shaft in a direction in which the fixed pulley is separated from and in contact with the fixed pulley. In a speed change pulley of a transmission, the rotary shaft is made of steel, and a hard chromium plating layer is formed on the outer peripheral surface of the rotary shaft, and the outer peripheral surface of the rotary shaft and the inner peripheral surface of the movable pulley. A bearing is interposed therebetween, and the bearing has an outer peripheral surface that abuts the inner peripheral surface of the movable pulley formed of a steel ring portion, and a sintered porous bronze is formed inside the steel ring portion. Since a layer is formed and a resin sliding layer formed by resin impregnation is formed on the inner peripheral surface that is in sliding contact with the outer peripheral surface of the rotating shaft, it can be used without lubrication and can be lubricated as before. No slippage of V-belt due to oil leakage In addition, the sliding resistance of the movable pulley can be made extremely low, the generation of iron oxide can be suppressed, and the expansion of the bearing gap due to wear can be reduced, preventing the movable pulley from swinging and falling, and It is possible to reduce the fluctuating load and improve the durability of the V belt.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of essential parts around a speed change pulley in a continuously variable transmission.

FIG. 2 is a sectional configuration diagram of a bearing.

FIG. 3 is an enlarged cross-sectional configuration diagram of a main part of the bearing of FIG.

FIG. 4 is a cross-sectional configuration diagram of a main part of a rotary shaft.

FIG. 5 is a cross-sectional configuration diagram of a conventional transmission pulley structure.

[Explanation of symbols]

 1 continuously variable transmission 2 speed change pulley 3 rotating shaft 3a plated layer 4 fixed pulley 5 bearing 5a steel ring part 5b porous bronze layer 5c resin sliding layer 6 movable pulley 7 V belt

Claims (1)

Claims for utility model registration: Claim 1. A fixed pulley fixed to a rotary shaft, and a movable member that is slidably moved on the rotary shaft in a direction that is fitted onto the rotary shaft and contacts and separates from the fixed pulley. In a speed change pulley of a continuously variable transmission including a pulley, the rotating shaft is made of steel, and a plating layer plated with hard chrome is formed on the outer peripheral surface of the rotating shaft. A bearing is interposed between the inner peripheral surfaces of the movable pulley, and the outer peripheral surface of the bearing, which abuts the inner peripheral surface of the movable pulley, is formed of a steel ring portion, and the inner side of the steel ring portion is formed. A transmission of a continuously variable transmission characterized in that a sintered porous bronze layer is formed, and a resin sliding layer formed by resin impregnation is formed on an inner peripheral surface of the rotary shaft that is in sliding contact with the outer peripheral surface. Pulley structure.